"Can you repeat that?" (5)

I think it could be either:

Which length description are you looking for?:

what

'can you repeat that?' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for what that I've seen before include "Word used in a question" , "I beg your pardon" , "That which - come again!" , "Eh?" , "Which thing?" .)

I've seen this clue in The New York Times and the USA Today.

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